节点位置对窃听信道安全容量的影响

随着无线通信技术的不断发展,无线通信中的安全问题已成为制约其发展的重要因素。文中基于香农信息论,从安全区域的角度分析了加入协作干扰后瑞利衰落窃听信道模型的安全性能,并且对窃听节点与协作干扰节点的位置变化与系统安全容量的关系进行了研究,然后在瑞利衰落信道模型下基于地理位置的变化对遍历保密容量进行了数值仿真。结果表明引入协作干扰节点可以提升系统安全容量,且适当增加协作者个数、调整协作者位置以及合理的功率分配都可以增强通信系统的安全性。

Influence of Nodes Location to Security Capacity in Wire-tap Channel

With the continuous development of wireless communication technology,security issues of wireless communication have become an important factor in its development. Based on Shannon information theory,from the viewof security region,analyze the security performance in Rayleigh fading channel after added the interference,and research on the relationship between the location change of eavesdropper and cooperative jammers and the security capacity of communication systems. Then the numerical simulations are provided for ergodic secrecy capacity based on geographic variation in Rayleigh fading channel. Simulation results showthat the cooperative jamming can improve system security capacity. Furthermore,the security of communication systems can be enhanced by appropriately increasing the number,flexibly adjusting the position of jammers and reasonably allocating the power.